Inserting sample string in @mean

[bobshackleton]

Could someone explain what the problem is with this code:

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%sample_string = @str({%date_project_begin}) + " " + _ @str({%date_project_bbox_end}) scalar mean_inventory_change = @mean(dbbinv, %sample_string)

As far as I can see

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%sample_string

is inserting two years and a space enclosed by quotations (i.e. "2010 2021"), which is what I think the coding should specify.

[EViews Gareth]

The manual is somewhat misleading on this. The @mean function only accepts a sample string if you are assigning into a series. If you are assigning into a scalar or a matrix, you can not include a sample string. Yes this is odd.

The simplest work around is to set the workfile sample before calculating the mean:

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%sample_string = @str({%date_project_begin}) + " " + @str({%date_project_bbox_end}) smpl {%sample_string} scalar mean_inventory_change = @mean(dbbinv) smpl @all

[bobshackleton]

OK thanks!